Bradford, Barbara Taylor, author
Grafton, 1990
Buku Teks
Meredith, Robert C., author
Thomas Y. Crowell, 1967
Buku Teks
Nurlailani, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1988
UI - Skripsi (Membership)
Hamilton, Alexander, author
New York The Liberal Arts Press 1957
Buku Teks
Moscow Foreign Languages Publishing House 1959
Buku Teks